Interaction of SN Ib 2004dk with a Previously Expelled Envelope

Pooley, David and Wheeler, J. Craig and Vinkó, József and Dwarkadas, Vikram V. and Szalai, Tamás (2019) Interaction of SN Ib 2004dk with a Previously Expelled Envelope. ASTROPHYSICAL JOURNAL, 883 (2). ISSN 1538-4357

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Abstract

The interaction between the expanding supernova (SN) ejecta with the circumstellar material (CSM) that was expelled from the progenitor prio to explosion is a long-sought phenomenon, yet observational evidence i poor, helium-rich Type Ib SN that reappeared as a strong {{H}} -emitting point source on narrowband {{H}}α images. We present follow-u optical spectroscopy that reveals the presence of a broad {{H}} component with full width at half maximum of ∼ 290 {km {{{s}}}-1 in addition to the narrow {{H}}α +[N II] emissio features from the host galaxy. Such a broad component is a clear sign o Newton Observatory, the Swift satellite, and the Chandra X-ra Observatory that span 10 days to 15 years after discovery. The detectio of strong radio, X-ray, and {{H}}α emission years after explosion allow various constraints to be put on pre-SN mass-loss processes. We presen a wind-bubble model in which the CSM is “pre-prepared” by a fast win interacting with a slow wind. Much of the outer density profile int which the SN explodes corresponds to no steady-state mass-loss process We estimate that the shell of compressed slow wind material was ejecte ∼1400 yr prior to explosion, perhaps during carbon burning, and that th SN shock had swept up about 0.04 {M}ȯ of material. Th region emitting the {{H}}α has a density of order {10}-2 {{g}} {cm}}-3

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